import pandas as pd# add FAST system noise on the blur map to simulate true observed mapsigma = 800 # mu Jy Standard Deviation of noise# read mapfilepath = homewangjiaxinfinalblurredflux_blurred_all_g

This error typically occurs when the file path or the key used to read the HDF5 file is incorrect.

To fix this error, you can try the following:

1. Check that the file path is correct and that the file exists at that location.
2. Check that the key used to read the HDF5 file matches the actual key used to save the data in the file.
3. Try opening the HDF5 file separately using h5py or a similar library to check if the file can be read and that the keys are correct.
4. Make sure that you have the required packages installed. In this case, pandas and numpy are needed to run the code.